World No.2 Novak Djokovic could face a hefty fine for touching chair umpire Damien Dumusois during a volatile Australian Open final on Sunday night.
The Serbian lost his cool after he was handed back-to-back time violations in the one game for taking too long to serve against Austrian fifth seed Dominic Thiem.
With the score locked at 4-4 in the second set, the second penalty came at break point and cost him a first serve, with Djokovic losing the game.
A furious Djokovic marched past the umpire's chair and tapped Dumusois's foot and sarcastically exclaimed to the French: "You made yourself famous, well done man".
Dumusois didn't react to Djokovic's comments or actions.
According to the official grand slam rule book, Djokovic could find himself facing a $20,000 fine, although penalties are discretionary.
The rules state: "Players shall not at any time physically abuse any official, opponent, spectator or other person within the precincts of the tournament site. Violation of this Section shall subject a player to a fine up to $20,000 for each violation."
Gunning for a record-extending eighth title at Melbourne Park, Djokovic claimed the first set 6-4.
He took issue with the Rod Laver Arena crowd getting behind underdog Thiem, who had never won a grand slam.
Despite leading, Djokovic took aim at the fans during the first set when he felt his serves were interrupted by crowd.
"Shut the f*** up," he was heard saying.